Fabrication, microstructure and electrocatalytic property of novel nanoporous palladium composites
Fabrication, microstructure and electrocatalytic property of novel nanoporous palladium composites
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DOI：
10.1016/j.jallcom.2010.08.094
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发表时间：
2010-10
影响因子：
6.2
通讯作者：
Xiaoguang Wang;Weimin Wang;Zhen Qi;Changchun Zhao;H. Ji;Zhonghua Zhang
中科院分区：
文献类型：
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作者：
Xiaoguang Wang;Weimin Wang;Zhen Qi;Changchun Zhao;H. Ji;Zhonghua Zhang
通过对快速凝固的Al 70 Pd 30合金在碱性或酸性溶液中进行化学脱合金处理，在自由腐蚀条件下制备了具有第二相嵌入的纳米多孔钯复合材料。采用X射线衍射、扫描电子显微镜和能谱分析对前驱体合金和脱合金纳米多孔复合材料的微观结构进行了表征。实验结果表明，前驱体合金由Al 3 Pd和Al 3 Pd 2金属间化合物组成，复合材料由脱合金的Al 3 Pd和未脱合金的Al 3 Pd 2镶嵌组成。此外，通过简单地改变脱合金溶液，纳米多孔基质中的韧带/通道的长度尺度可以从3- 6 nm调节到15- 25 nm。电化学实验表明，这些纳米孔Pd复合材料具有较高的电化学活性表面积，在碱性介质中对甲醇和乙醇的氧化具有显著的电催化活性。这些新型的纳米多孔钯复合材料将在直接醇燃料电池、催化、传感、驱动等领域，特别是负载相关领域中找到潜在的应用。
Nanoporous palladium composites with second phase embeddings can be fabricated through chemical dealloying of a rapidly solidified Al70Pd30alloy in alkaline or acidic solutions under free corrosion conditions. The microstructure of the precursor alloy and as-dealloyed nanoporous composites was characterized using X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. The experimental results show that the precursor alloy is composed of Al3Pd and Al3Pd2intermetallic compounds, and the resultant composites comprise the nanoporous palladium matrix dealloyed from Al3Pd and the undealloyed Al3Pd2embeddings. Moreover, the length scale of ligaments/channels in the nanoporous matrix can be adjusted from 3–6nm to 15–25nm by simply changing the dealloying solution. The electrochemical experiments demonstrate that these nanoporous Pd composites have high electrochemical active surface areas and exhibit remarkable electrocatalytic activities towards methanol and ethanol oxidation in alkaline media. These novel nanoporous Pd composites will find potential applications in fields of direct alcohol fuel cells, catalysis, sensing, actuation, and especially load-related areas.